Radiotelephone system



L. DEIFOREST.

RADIOTELEPHONE SYSTEM. APPLICATION FILED Aus.26.191a.

1, 34:8, 2 1 3. Patented Aug. 3, 1920.

"UNITED STATES PATENT OFFICE.

m FOREST, 0! NEW YORK, N. Y., ASSIGNOB TO DE FOREST RADIO mnrnon AID coxrm, OF NEW YORK, N. Y., A COBPOILTIOH OI Dmwarm.

BADIOTELEPKONE BYBTEI.

Specification of Letters Patent.

Application fled August 28, 1916. Scrlal No. 111,064.

To all whom it may concern-.- Be it known that 1, LE on Fonns'r, a citizen of the United States, residing at New York, in the county of Bronx,'State of New York, have made a certain new and useful finally pointed out in the appended'claims,

Referring to the drawings Figure 1 is a diagrammatic view of a wiring arrangement and embodying my invention.

Fig. 2 is'a similar view showing a modified arrangement. 7

Fig. 3 is a similar view showing another modified arrangement.

The same part is designated by the same reference numeral wherever it occurs throughout the several views.

The extreme sensitiveness of an escaping jet of air or gas to sound disturbances applied at a point near where said jet emerges from a nozzle, is well known. The form and intensity of the air or gas jet/are directly affected by sound waves, am the same time made the path of an electric are or stream of sparks, the conductivity of said jet to the are or spark stream is like wise altered or disturbed in perfect response to the sound acting upon the jet.

It is among. the special purposes of my present invention to apply the foregoing principle to a radio telephone or telegraph transmitter system.

In the drawings, G designates a source of electric current, in this instance shown to be a direct current generator, but my broad invention, as defined in the claims, is not to be limited in this detail. the source of current is an impedance coil K. The terminals of the current source are if the jet is at In series with connected across a capacity C which forms in con unction with the are or spark ap P N, a primary oscillating s stem inclu mg therein the inductance L. eference letter L designates a nozzle, preferabl of cop )er, silver, brass tungsten or the li e, whic is supplied with gas or air under high pressure (from to pounds air from a supply reservoir In Fi 1 the gas 'or ai I et impinges against a be le plate electrode which may be madehollow and water cooled, as shown, D and T being re spectively the inlet and outlet pipes for the circulating water cooling system.

The antenna-earth system may be associated with the primary oscillating system in any desired manner, conductivel through square inch) damped, since the current flow passes easily in one direction but with great diflicultyin the opposite direction. On this account, it is unnecessary to .tune the radiatingcircuit A S L E to the primary circuits Normally a stream of rapidly following, unidirectional electric discharges pames from the nozzle X to plate P, and a ractically continuous series of waves is t erefore radiated from the antenna. When, however, the voice is directed in mouth piece M, the sound vibrations at 0 cause the air or gas jet from N to spread or fan out and in again in faithful accordance with each individual sound wave, The conductivity of this gas jet is correspondingly affected with the result that the energy of the primary dischar e is varied in unison with the voice at This in turn causes a like variation in the am litudes of the waves or trains of waves radiated from the antenna system; and the signal is thus transmitted through space.

In Fig. 2 I show a modification of the arc or spark gap arrangement. In this figure, one electrode R is in the form, of a small disk suitably supported at the end of a rod, and surrounded at "a short distance, preferably from to of an inch, by the other electrode P, in the form of a flanged ring. Ordinarily, the gas jetfrom N is adjust been described, is inserted jusled so that it impinges onl against the disk R, and the resistance 0 the annular air gap between 'R-"and P-is low, the ionized gas or metal vapors remaining in this annular space, so that. the arc is non-oscillatory, or largely so. When, however, sound waves at O disturb the gas 'et and "cause it to flutter, the eflect upon t 1e "conductivity of the'gap is marked and instantaneous so that the degree of oscillatory energy isthereby directly controlled.

In Fig. 3, such a spark or are ap as has directly in the earth connection of an antenna system, which is energized from a primary source of high frequency oscillations in the usual manner through an oscillating transformer shown at L, S. The conductivity of the gas gap is voice controlled as already described, by means. of the gas jet from N and the signaling device Instead of ordinary air jets, I may also use illuminating gas rendered more conducting by" enrichment by salts, such as sodium or potassium. Therefore, it is to be understood'fthat'where herein I mention air, or a jet of air, that term includes a gas as contemplated by my inventiom Instead of the direct current cnerator as the source of energy, I may emp oyjan alternating current generator, preferably of several thousand cycles frequency and in which 7 easel also employ the usual step up transformer B between the alternating current generator G and the condenser C of the primary oscillating circuit,- as shown in Fig. 2.

meme

If it is desired to use the signaling sysis necessary to apply a spund producing buzzer, or interrupter, at the point ,0 near the nozzle N- in place of the vo'ce tube, and

control this huzze; by a sina l' Morse key in series .With the battery which energizes the buzzer.

I show such an arrangement in Fig. 3 wherein the buzzer is designated at F, the ke at K and the current source at H.

aving now set forth the objects and 'nature of my invention, what I claim as new and useful and of my own invention, and desire to secure by Letters Patent, is-

1. In a radio transmitting system, an oscillating circuit includin a spark gap therein comprising separated electrodes, means for directing a continuous jet of air against one of said electrodes, and means controlled by sound waves for directing said jet of air against the other of said electrodes,

In a radio transmitting system, an OS; clllatl'ng c1rcu1t includin a spark gap therein comprlsing separate electrodes, means for directing a jet of air against one of said electrodes, and means located adjacent said jet of air and controlled by sound waves for directing said jet of air against the other of said electrodes.

In testimony whereof I have hereunto set my hand on this 24th day of August, A. Dr, 1916.

LEE on 4. 

